JAJSCY7A December   2014  – December 2015 DRV5053-Q1

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Magnetic Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Field Direction Definition
      2. 7.3.2 Device Output
      3. 7.3.3 Power-On Time
      4. 7.3.4 Output Stage
      5. 7.3.5 Protection Circuits
        1. 7.3.5.1 Overcurrent Protection (OCP)
        2. 7.3.5.2 Load Dump Protection
        3. 7.3.5.3 Reverse Supply Protection
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Typical Application With No Filter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Filtered Typical Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Typical Noise Versus Cutoff Frequency
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10デバイスおよびドキュメントのサポート
    1. 10.1 デバイス・サポート
      1. 10.1.1 デバイスの項目表記
      2. 10.1.2 デバイスのマーキング
    2. 10.2 コミュニティ・リソース
    3. 10.3 商標
    4. 10.4 静電気放電に関する注意事項
    5. 10.5 Glossary
  11. 11メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The DRV5053-Q1 device is used in magnetic-field sensing applications.

8.2 Typical Applications

8.2.1 Typical Application With No Filter

DRV5053-Q1 Typ_app_lis153.gif Figure 12. Typical Application Schematic – No Filter

8.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 2 as the input parameters.

Table 2. Design Parameters

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
System bandwidth ƒBW 15 kHz

8.2.1.2 Detailed Design Procedure

The DRV5053-Q1 has internal filtering that limits the bandwidth to at least 20 kHz. For this application no external components are required other than the C1 bypass capacitor, which is 0.01 µF minimum. If the analog output OUT is tied to a microcontroller ADC input, the equivalent load must be R > 10 kΩ and C < 10 nF.

Table 3. External Components

COMPONENT PIN 1 PIN 2 RECOMMENDED
C1 VCC GND A 0.01-µF (minimum) ceramic capacitor rated for VCC

8.2.1.3 Application Curve

DRV5053-Q1 scope_1_slis153.png
Figure 13. 10-kHz Switching Magnetic Field

8.2.2 Filtered Typical Application

For lower noise on the analog output OUT, additional RC filtering can be added to further reduce the bandwidth.

DRV5053-Q1 Typ_app_2_lis153.gif Figure 14. Filtered Typical Application Schematic

8.2.2.1 Design Requirements

For this design example, use the parameters listed in Table 4 as the input parameters.

Table 4. Design Parameters

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
System bandwidth ƒBW 5 kHz

8.2.2.2 Detailed Design Procedure

In this example we will add an external RC filter in order to reduce the output bandwidth.

In order to preserve the signal at the frequencies of interest, we will conservatively select a low-pass filter bandwidth (–3-dB point) at twice the system bandwidth (10 kHz).

Equation 1. DRV5053-Q1 detailed_des_eq_lis153.gif

If we guess R1 = 10 kΩ, then C2 < 1590 pF. So we select C2 = 1500 pF.

8.2.2.2.1 Typical Noise Versus Cutoff Frequency

RC filters are an effective way to reduce the noise present on OUT. The following shows typical noise measurements for different cutoff frequencies using the DRV5053VA.

Table 5. DRV5053VA Typical Noise Data

R (Ω) C (µF) fCUTOFF (kHz) NOISE (mVpp)
163 0.1 9.8 30.4
349 0.1 4.6 22.8
750 0.1 2.1 15.2
1505 0.1 1.1 9.7
3322 0.1 0.5 5.3
7510 0.1 0.2 2.5

8.2.2.3 Application Curves

DRV5053-Q1 scope_2_slis153.gif
Figure 15. 5-kHz Switching Magnetic Field
DRV5053-Q1 D011_SLIS153.gif
R1 = 10-kΩ pullup C2 = 680 pF
Figure 16. Low-Pass Filtering